Closed
Description
Hardware:
Board: ESP32-S2 Wrover
Core Installation version: unofficial - branch - esp32s2, commit baaff84 and release/4.2-beta1 of ESP-IDF
IDE name: Visual Studio with VisualGDB
Flash Frequency: 80Mhz
PSRAM enabled: I don't have a clue how to check it
Upload Speed: 115200
Computer OS: Windows 10 Pro
Description:
I'm using Serial1 for communicating with modbus device. For that I found a great library that relies on Serial.Flash() for ensuring that transmission has ended. What we found out in this issue: emelianov/modbus-esp8266#85, Arduino liblaries are bugged, and Serial.Flush() is not waiting for the end of transmision.
Sketch:
#include <Arduino.h>
void setup()
{
Serial1.begin(9600, SERIAL_8E1, GPIO_RXD, GPIO_TXD);
pinMode(GPIO_RTS, OUTPUT);
}
void loop()
{
digitalWrite(GPIO_RTS, HIGH);
uint8_t data[] = { 0x0, 0x1, 0x2, 0x3, 0x4 };
Serial1.write(data, 4);
Serial1.flush();
digitalWrite(GPIO_RTS, LOW);
delay(1000);
}Debug Messages:
